Yes, that is true in Daniel, but Chapter nine, the angels comes to explain the first and second visions to Daniel. Dan 9:24 states 70 weeks which is multiply by 7 gives you 490 years. This is the actual time given to Israel which ended when Stephen was stone. The door of Israel as a nation was closed for good. It also begins the Gospel to the eldest son Japheth. Ham children were first especially Canaan. Gen 15:16 showed that YAHWEH gave them 400 years. In Genesis, that most seem to misunderstand is that YAHWEH said in the 4th generation, which in Hebrew means ages or years. However, just before Stephen was stoned he gave the exact years of 400 as well. The people who claim they are Israel are not from Shem they are from Japheth and that is a fact. They even call themselves Ashkenazi's who was Gomer's Son. Israel of Shem ended. Gen 9:27
Subtracting 490 years from 2300, you have 1810 years. The way you have understand the prophecy is the death of YAHSHUA, specifically the date of HIS death. It had to do with the burnt offering and not the passover supper. YAHSHUA did that in the Garden, HE became our PASSOVER, and HIS human body almost died, but was revived to die on the tree! HE was THE TRUE LAMB to take away sin from all who would accept HIS death as their BURNT OFFERING. HE died in AD 31 so to add that number to 1810 brings you 1844 on the exact day of Atonement in Heaven began judgment for the righteous dead first, then righteous living, then the wicked but the executive judgment for the wicked and the evil angels will be met when YAHSHUA return with HIS saints to give everyone their just reward!
The 3 1/2 have years was for the time the little horn would think to change time (the Holy Convocations which included the Sabbath), and HIS Judgments Laws. If you know anything about mathematic is has to do with symbols especially Algebra, Geometry and Statistics. You have to work out the solutions to get to the answer. The Bibles says YAHWEH adds by multiplying, and subtracts by dividing and prophetic things must be understood and that comes through prayer by receiving THE HOLY SPIRIT.
Finally, the prophecies are not outdated! The problem comes from people who have turn from truth and from THE ONE who leads each one to truth if they desire to listen. As I stated earlier, John and Daniel saw the 1844 message first and it was Daniel who was also given the date and time. The last who will receive the message is the great multitude who is witness by those ordained to be YAHWEH'S Israel or overcomers, the 144,000 John saw the number, but Daniel saw them also. EGW was only given what was already given to both of them in the Bible. She just confirmed that the Word of ELOHIM is steadfast and never changes. However, people change and think they need nothing, but do not realize that they are wretched, naked, poor and blind. If you want to be saved then it is very simple stop putting down EGW visions and read the prophecies from the Bible in prayer and pray that THE HOLY SPIRIT will come and give you eyesalve that you eyes will come open!!!!
Blessings!